#include <stdio.h>

int main()
{
    int n, a, b;
    printf("There are following numbers with 4 digits satisfied condition:\n");
    for (n = 1000; n < 10000; n++)
    {
        a = n / 100;
        b = n % 100;
        if ((a + b) * (a + b) == n)
            printf(" %d", n);
    }
}